garrytan/gstack · error · Error

--width must be a number

Error message

--width must be a number

What it means

Error "--width must be a number" thrown in garrytan/gstack.

Source

Thrown at browse/src/write-commands.ts:1019

      let viewportWidth: number | undefined;
      let outputPath: string | undefined;

      for (let i = 0; i < args.length; i++) {
        if (args[i] === '--scroll-to' && i + 1 < args.length) {
          scrollTo = args[++i];
        } else if (args[i] === '--cleanup') {
          doCleanup = true;
        } else if (args[i] === '--hide' && i + 1 < args.length) {
          // Collect all following non-flag args as selectors to hide
          i++;
          while (i < args.length && !args[i].startsWith('--')) {
            hideSelectors.push(args[i]);
            i++;
          }
          i--; // Back up since the for loop will increment
        } else if (args[i] === '--width' && i + 1 < args.length) {
          viewportWidth = parseInt(args[++i], 10);
          if (isNaN(viewportWidth)) throw new Error('--width must be a number');
        } else if (!args[i].startsWith('--')) {
          outputPath = args[i];
        } else {
          throw new Error(`Unknown prettyscreenshot flag: ${args[i]}`);
        }
      }

      // Default output path
      if (!outputPath) {
        const timestamp = new Date().toISOString().replace(/[:.]/g, '-').slice(0, 19);
        outputPath = `${TEMP_DIR}/browse-pretty-${timestamp}.png`;
      }
      validateOutputPath(outputPath);

      const originalViewport = page.viewportSize();

      // Set viewport width if specified
      if (viewportWidth && originalViewport) {

View on GitHub (pinned to 94993f7401)

When it happens

Trigger: Thrown at browse/src/write-commands.ts:1019 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of garrytan/gstack@94993f7401 (2026-08-12). Data as JSON: /api/errors/1a2ef53a9b7a6503. Report an issue: GitHub.